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Zen is a modern, powerful, HTML5 starting theme with component-based CSS and a responsive, mobile-first grid design. If you are building your own standards-compliant theme, you will find it much easier to start with Zen than to start with Bartik or Stark. This theme has fantastic online documentation and tons of helpful code comments in its JavaScript, PHP, HTML, CSS and Sass.
Zen now comes with modern front-end development practices!
The ACL module, short for Access Control Lists, is an API for other modules to create lists of users and give them access to nodes. It has no UI of its own and will not do anything by itself; install this module only if some other module tells you to.
We're aware of the following modules using ACL (let us know if you know of others):
Content Access (optionally uses ACL to provide by-user access control)
The refresh module adds the functionality to have the "node display page" automatically refresh (using a meta refresh) using a (per node) configurable number of seconds.